Reproducibility of Quantitative Flow Ratio: The QREP Study

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BACKGROUND: Quantitative flow ratio (QFR) is a tool for physiological lesion assessment based on invasive coronary angiography.

AIMS: We aimed to assess the reproducibility of QFR computed from the same angiograms as assessed by multiple observers from different, international sites.

METHODS: We included 50 patients previously enrolled in dedicated QFR studies. QFR was computed twice, one month apart by five blinded observers. The main analysis was the coefficient of variation (CV) as a measure of intra- and interobserver reproducibility. Key secondary analysis was identification of clinical and procedural characteristics predicting reproducibility.

RESULTS: The intraobserver CV ranged from 2.3% (1.5-2.8) to 10.2% (6.6-12.0) among the observers. The interobserver CV was 9.4% (8.0-10.5). The QFR observer, low angiographic quality, and low FFR were independent predictors of a large absolute difference between repeated QFR measurements defined as a difference larger than the median difference (>0.03).

CONCLUSIONS: The inter- and intra-observer reproducibility for QFR computed from the same angiograms ranged from high to poor among multiple observers from different sites with an average agreement of 0.01±0.08 for repeated measurements. The reproducibility was dependent on the observer, angiographic quality and the coronary artery stenosis severity as assessed with FFR.

TidsskriftEuroIntervention : journal of EuroPCR in collaboration with the Working Group on Interventional Cardiology of the European Society of Cardiology
StatusE-pub ahead of print - 6 jul. 2021

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